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Name

velmap - various galactic velocity field mapping routines

Synopsis

velmap [parameter=value]

Description

VELMAP has various mapping routines that can be done on galactic velocity field. The velocity field can be from observations, or a model.

In practice this also means that on a set of projected rings, defined by their radii, a center, position angle and inclination, various computations can be done and tabulated.

An output map can be generated with amusing quantities.

Parameters

The following parameters are recognized in any order if the keyword is also given:
in=
input velocity field, in image(5NEMO) format.
radii=
radii of the ring boundaries. For N rings, N+1 values need to be give. They need to be sorted by increasing radius.
pa=
position angle of disk, in degrees. [0]
inc=
inclination angle of disk, in degrees [45]
center=
rotation center. Default is the mapcenter ((Nx-1)/2,Ny-1)/2) where 0,0=center of lower left pixel.
vsys=
systemic velocity [0]
den=
input density image, only needed if surface brightness (d) given in an output mode. Default: not used. mode=. Default: none.
frang=
free angle around minor axis (2*frang is the total angle around the minor axis used). [Default: 0]
blank=
Value of the blank pixel to be ignored. Default: 0.0
mode=
Output mode for the output data file. Valid are: v, v/r (angular velocity), v*d/r (angular velocity times surface brightness)
out=
Optional output file. See mode= which quantity. Default: none
tab=
Optional output table file. This will contain the radius, rotation speed, dispersion in the ring and some other values.

See Also

rotcur(1NEMO) , velfit(1NEMO) , runvelfitss07(1NEMO) , rotcurshape(1NEMO)

Files

src/image/rotcur : velmap.c

Author

Peter Teuben

Update History


3-feb-2011    created for Nurur    PJT


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